There are 17 Legendary Weapons. If you collect all of them, you will earn the “Horde Mode” achievement. Follow the instructions below to unlock and get all 17 Legendary Weapons.
Legendary Weapon #1 – Arken’s Crossbow
Augmentations: Flame, Piercing, and Silver
How to Unlock: Find the Silver Chest in Darkwood Lake and unlock it with 15 Silver Keys.
Legendary Weapon #2 – Avo’s Tear
Augmentations: Health, Mana, and Experience
How to Unlock: Complete “The Hidden Sword” quest, given to you by the Guildmaster. You can also receive this sword by choosing not to accept the Sword of Aeons, as explained later on.
Legendary Weapon #3 – Cutlass Bluetane
How to Unlock: Open the Demon Door in the Greatwood Caves by achieving an active combat multiplier of at least 14.
Legendary Weapon #4 – Dollmaster’s Mace
How to Unlock: Open the Demon Door on the Abandoned Road by talking to it while wearing the Bright Platemail Suit, the Dark Will User’s Outfit, and the Bandit Outfit.
Legendary Weapon #5 – Katana Hiryu
Augmentations: Flame and Sharpening
How to Unlock: Find the Silver Chest in the bedroom at Bowerstone Manor and unlock it with 15 Silver Keys. You must either marry Lady Grey or become mayor to gain access to this area.
Legendary Weapon #6 – Murren Greataxe
How to Unlock: Find the Silver Chest at the top of the Lighthouse at Hook Coast and unlock it with 15 Silver Keys.
Legendary Weapon #7 – Murren Greathammer
Augmentations: Piercing and Experience
How to Unlock: Find the Silver Chest at the Heroes’ Guild and unlock it with 20 Silver Keys.
Legendary Weapon #8 – Orkon’s Club
How to Unlock: Find and open the chest near Archon’s Shrine.
Legendary Weapon #9 – Ronok the Axe
Augmentations: Sharpening and Silver
How to Unlock: Open the Demon Door behind the Grey House by marrying Lady Grey.
Legendary Weapon #10 – Skorm’s Bow
Augmentations: Lightning and Sharpening
How to Unlock: You need evil points to get this weapon. There are two methods you can use. First, you can sacrifice your followers, either between 3 and 4 in the morning for a good player, or right before the sun sets for an evil player. The second option is to sacrifice the trader at the Chapel of Skorm right before morning in the “Trader Escort” quest. You should save your game before you attempt this, so you can try again if your timing is off.
Legendary Weapon #11 – Solus Greatsword
Augmentations: Flame, Health, and Sharpening
How to Unlock: There are two ways you can get this weapon. First, go through “The Arena” quest to unlock Bowerstone North. There, you can buy the Solus Greatsword from a trader. The second method is to marry Lady Grey, give her gifts, and flirt with her. She will give you an unaugmented Solus Greatsword as a present.
Legendary Weapon #12 – Sword of Aeons
Augmentations: Health, Mana, Experience, and Sharpening
How to Unlock: Once you defeat the final boss in the Chamber of Fate, sacrifice your sister to get this weapon. Otherwise, you will destroy it and receive Avo’s Tear instead.
Legendary Weapon #13 – The Avenger
Augmentations: Flame and Lightning
How to Unlock: Find the Silver Chest at the Lost Bay and unlock it with 30 Silver Keys.
Legendary Weapon #14 – The Bereaver
How to Unlock: Open the Demon Door at Necropolis by giving it all of the Silver Keys you’ve found. If you have any Silver Keys, open all of the Silver Chests before you open this door!
Legendary Weapon #15 – The Harbinger
Augmentations: Sharpening and Piercing
How to Unlock: Pull this sword out of the rock up the hill from the Temple of Avo. You will either need full stats, or you can attempt to pull it out and then upgrade your physique 5 times, your health 2 times, and your toughness 3 times, and then try again.
Legendary Weapon #16 – The Sentinus
Augmentations: Silver and Piercing
How to Unlock: To get this weapon, you must donate money to the Temple of Avo. If you are partly/fully evil, you will have to donate between 35,000 and 40,000. A partly/fully good character may have to donate as much as 300,000. You can become partly evil, get this weapon, and then become good again, to avoid the higher amount.
Legendary Weapon #17 – Wellow’s Pickhammer
How to Unlock: Open the Demon Door at Greatwood Gorge by either being 100% evil or by eating 11 Crunchy Chicks in front of it.
[more cheats for Fable: Anniversary here]